Former President Donald Trump and Vice President Kamala Harris are set to face off in a debate moderated by ABC's David Muir and Linsey Davis. The event will be held at the National Constitution Center in Philadelphia, a key battleground state. The debate, lasting 90 minutes with two commercial breaks, will start at 9 p.m. ET. Harris' team initially opposed the agreed-upon muted microphone rule but relented to avoid jeopardizing the debate. Trump won the coin toss for the final closing statement.